Prompt Template Manager
🔒 In your browserFill {{variables}} in a reusable prompt with a live preview and missing-value checks.
How it works
Write a reusable prompt with {{variables}}, fill in the values, and get the finished prompt. It auto-detects your variables, renders a live preview, and flags any that are missing or unused. Runs entirely in your browser.
Variables (4)
Rendered prompt
You are {{role}}, helping {{user_name}}.
Task: {{task}}
Answer in {{tone}} tone. If {{task}} is unclear, ask one clarifying question first.⚠ Missing value(s): {{role}}, {{user_name}}, {{task}}, {{tone}}
Variables use {{name}} syntax and names may contain letters, numbers, _, - and .. Nothing is uploaded — your template and values stay in your browser.
About the Prompt Template Manager
If you reuse the same prompt with different inputs — a support reply, a summary, an agent instruction — hard-coding the values each time is slow and error-prone. This free prompt template manager lets you write a prompt once with {{variables}}, fill in the values, and get the finished prompt, with missing and unused values flagged.
It runs entirely in your browser; your template and values are never uploaded.
How to use it
- Write your prompt and mark the parts that change with {{variable}} placeholders.
- The tool detects every variable and gives you a field for each.
- Fill in the values and watch the rendered prompt update live, then copy it.
- Missing values are highlighted (and left as placeholders), and any values you provided that aren't in the template are listed as unused.
Why templating prompts helps
Reusable prompts are more consistent and easier to maintain than pasting fresh text each time — you edit the wording in one place, and every filled prompt stays in sync. The variable syntax also makes prompts easy to store, share with a team, or wire into an application later, since the placeholders map cleanly to inputs.
Frequently asked questions
What variable syntax does it use?
Double curly braces: {{variable}}. Names can contain letters, numbers, underscores, hyphens and dots. A variable used more than once only needs to be filled in once.
What do 'missing' and 'unused' mean?
Missing means the template uses a variable you haven't given a value for — it's left as a placeholder and highlighted. Unused means you entered a value for a name that doesn't appear in the template.
Can I use this for agent or system prompts?
Yes. It works for any reusable text — system prompts, agent instructions, email templates or LLM prompts — anywhere you swap in different values.
Is my template uploaded?
No. Detection and rendering happen entirely in your browser.
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🔗 Embed this tool on your website — free
Copy this and paste it into your page's HTML. The tool runs in the visitor's browser, just like here. Change height to fit, or add the optional auto-resize snippet below. Add ?theme=dark to the URL for dark mode.
<iframe src="https://toolhq.dev/embed/prompt-template-manager/" title="Prompt Template Manager — ToolsHub" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" loading="lazy"></iframe>Optional: auto-resize the iframe height
Add this once on the same page so the iframe grows to fit the tool:
<script>
addEventListener("message", function (e) {
if (e.data && e.data.type === "toolshub:resize") {
document.querySelectorAll('iframe[src*="/embed/"]').forEach(function (f) {
if (f.contentWindow === e.source) f.style.height = e.data.height + "px";
});
}
});
</script>